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大家知道,通常只用一只晶体管的音调控制电路,其噪音性能是不好的,而且在大的1V有效值输出时,畸变达1%.用两只晶体管直接耦合,第一级共发射极工作,第二极接成共集电极,可以大大改善信号噪音比.这里第一级电流可以取为100μA,使信号噪音比大大提高.这种两管电路常被采用,但要用一个缓冲级以防止过激闭锁.
As we all know, usually only a transistor tone control circuit, the noise performance is not good, but also in the large 1V rms output distortion of 1%. With two transistors directly coupled, the first common emitter Work, the second pole connected into a common collector electrode, can greatly improve the signal to noise ratio where the first-class current can be taken as 100μA, the signal to noise ratio greatly improved.This two-tube circuit is often used, but to use a buffer level To prevent over-locking.